Typewriting machine



April 30, 1929. F. A. HART TYPEWRITING MACHINE Filed Deo. 24. 1927 5 Sheets-Sheet April 30, 1929. F. A. HART TYPEWRITING MACHINE Filed DESC. 24, 1927 5 Sheets-Sheet INVENTOR @AKW 5% WITNESSE W4, iba-.L

ATTORNEY April 30, 1929. F. A. HART TYPEWRITING MACHINE Filed Dec. 24, 1927 5 Sheets-Sheet WITNEssEs NVENTOR Mw/Mfr BY Mawb ATTORNEY S'Sheets-Sheet 4 ZM im F. A. HART TYPEWRITING MACHINE Filed Dec. 24, 1927 April 30, 1929.

A/ TTORNEY F. A. HART April 30, 1929.

TYPEWRITING MACHINE 5 Sheets-Sheet Filed Dec. 24, 1927 INVENTOR WITNESSEJS MM 444ml* Bvd@ L t ATTORNEY Patented Apr. 30, 1929.

UNITED STATES 1,710,685 PATENT OFFICE.

FREDERICK A. HART, OF NEW BRITAIN,

CONNECTICUT, ASSIGNOR T0 REMINGTON TYPEWRITER COMPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Application led December 24, 1927. Serial No. 242,423.

My invention relates to typewriting or like machines, and more particularly to tabulating mechanism for automatically jumping the carriage from one columnar field to another, together with the provision of means for back spacing the carriage, when desired, from different positions to which the carriage is automatically tabulated.

The main object of my invention, generally stated, is to produce comparatively simple and highly effective means by which the above results may be attained.

To the above and other ends which will hereinafter appear, my invention consists in the features of construction, arrangements of parts and combinations of devices set forth in the following description and particularly pointed out in the appended claims.

In the accompanying drawings, in which like reference characters represent corresponding parts in the different views F ig. 1 1s a fragmentary, rear elevation, with parts in section, of a typewriting machine equipped with the devices of my invention.

Fig. 2 is a fragmentary, vertical, fore and aft sectional view of the same, showing some of the parts at the rear portion of the machine. y

Fig. 3 is a detail, full sized, perspective view of the cam-bar for controlling the auxiliary feed rack.

Fig. 4 is an enlarged, detail, fore and aft vertical sectional view of a portion of the escapement and back-spacing mechanism and some of the associated parts.

Fig. 5 is a fragmentary, enlarged, detail, top plan View showing the cam-bar, the auxiliary feed rack, an-d some of the associated parts. y

Fig. 6 is a fragmentary, detail, top plan view showing in part a conventional representation of a portion of the carriage, some of the parts for effecting an automatic return of the carriage and a bill sheet in position on the platen.

Fig. 7 is a detail, yfragmentary front face view of the mutilated feed rack with teeth carrying end portions thereof broken away.

Fig. 8 is an enlarged, detail, perspective View of the contact device, on the auxiliary feed rack 41, which coacts with the cam bar.

Fig. 9 is a left-hand side vieW of thel machine with parts omitted, and showing more particularly parts of the automatic carriage return mechanism.

I have shown my invention embodied, in the present instance, in a Remington frontlfeed bookkeeping machine equipped with the power driven carriage return mechanism of my Patent N o. 1,567,590 dated December 29, 1925. However, have shown only so much of said machine, thus equipped, as is necessary to arrive at an understanding of my invention in its embodiment therein.

The features of the present invention may be readily included in a machine of the character specified without materially modifying the structural features thereof as they now exist. While this is a desirable factor of the present invention, it should be understood, nevertheless, that the invention is not restricted to inclusion in such machines, but may be employed in typewritin machines generally, wherever found availa le.

The main frame of the machine comprises a top plate 1, corner posts 2 and a base 3. The usual carriage, comprising end bars 4, a front cross bar 5 and a rear cross bar 6, supports a laten 7 and is mounted front and rear in t e usual manner on crossed rollers 8 to travel from side to side of the machine over the top plate 1.

The carriage is controlled for step-by-step letter space movement by feed dogs 9 and 10 which coact with an escapement wheel 11 fixedly secured to an escapement Wheel shaft a.

perative connection between the escapement wheel and a back spacing wheel 12 is effected by a backing pawl 13 so that the escapement wheel and back spacing wheel turn together in the forward movement of the escapement wheel, but the back spacing wheel may be turned in the reverse direction independently of the escapement wheel. The back spacing wheel 12. is ixedly connected with a feed pinion 14 so that a reverse movement of the back spacing Wheel by the back spacing devices, to be later described, will effect a stepby-step backward rotation of the feed pinion 14 and cause the carriage to be back spaced, whereas during the advance of the esca ement Wheel, such wheel, the back spaclng wheel and the feed pinion will turn together to afford a step-by-step letter feed advance of the carriage.

The escapement mechanism and back spaeing devices thus far described are of the usual construction except that in the present instance the feed pinion 14 is considerably longer than that ordinarily employed since it is intended to coact with two feed racks instead of one as is ordinarily the case.

The back spacing mechanism which controls the feed pinion is of the usual construction and includes the following devices:

A back spacing key lever 15 has its key at the keyboard of the machine and is connected with a pull link 16. The upper end of said link is pivoted at 17 to an arm 18 on one end of a rock shaft 20. The opposite end of said rock shaft carries a second crank arm 21 connected at its end to one end of a push link 22. The other end of said push link is pivoted at 23 to a back spacing pawl 24, which in turn is pivoted at 25 on a pawl carrier 26. This pawl carrier is supported for pivotal movement around the axis of the escapement wheel shaft a and is limited in its movement to normal position under the action of its returning spring b by an adjustable screw stop c. A depression of the back spacing key actuates the back spacing pawl 24 through the above described train of connections and turns the back spacing wheel 12 and feed pinion 14 back one letter space independently of the line spacing Wheel, and this movement will be transmitted to the carriage in a manner which will hereinafter appear.

The means by which the carriage is automatically jumped from one columnar field to the next comprises a mutilated feed rack 27, shown in detail in Fig. 7. This rack is made from materially heavier stock than ordinary feed racks in order that the teeth, some of which arrest the carriage in its tabulating movements, may be of sufficient thickness and strength to stand the strain to which they are subjected. Referring more particularly to Figs. 1 and 2 it will be seen that the rack 27 is secured near its ends by screws 28 to a cross bar 29 which is fixed to arms 30 pivoted at 31 to lugs 32 on the rear cross bar of the carriage. This manner of mounting the feed rack 27 is the same as the manner of mounting the ordinary feed rack usually employed in the machine. In addition to the screws 28 I employ a centrally located screw 33 (see Fig. 2) having a circumferential shoulder or fiange 34 and a rearward extension or pin 35. This screw is threaded into a tapped opening in the cross bar 29 and further secures the rack 27 to the cross bar 29, whereas, the pinlike extension 35 performs an additional function, as will presently appear. A leaf spring 36 pulls down on the cross bar 29 and tends to maintain the rac 27 in its lowermost position and in mesh with the feed pinion. This feed rack is limited in its downward movement by an adjustable screw stop 37 which coacts at its lower end with a stop 38 on the carriage. As shown in Fig. 1 the usual carriage releasing mechanism is employed comprising a release key 39 controlling a lever, a rearwardly extending arm 40 of which underlies one end of the rack bar 27.

On the depression of the release key the arm 40 will lift the rack 27 against the force of the spring 36 and disengage the rack from the feed pinion 14. In the operation of the construction as thus far described it will be understood that the carriage will receive a step-by-step letter feed advance at each printing operation as long as any of the teeth d of the mutilated rack 27 engage the feed pinion 14 but as soon as an untoothed portion e of the rack reaches the feed pinion the carriage will run free until the next lapproaching tooth d of the rack reaches the feed pinion and arrests the carriage. So on, the carriage may thus be successively letter spaced While writing a predetermined number of characters in one columnar field and then automatically tabulated to the next columnar field throughout the entire length of travel of the carriage from right to left, or throughout so much of such travel of the carriage as it may be deemed necessary or desirable to have the automatic tabulating movement of the carriage occur in. It will be understood of course that in every instance the mutilated rack is cut to accord with the particular work to be performed on the machine, so far as the location, width and number of columns employed are concerned.

Automatic tabulation effected with the aid of mutilated racks have been used long prior to my present invention, but there are certain difiiculties presented in the use thereof in certain circumstances which it is the purpose of the present invention to overcome. Thus, for example, the mutilated rack is cut so as to af'f'ord the writing of a definite number of, say, numerical characters in each column before automatically jumping the carriage to the next column. It sometimes occurs that it is necessary to Write more than the allotted number of characters in some or all of such columns. Ordinarily this cannot be done inasmuch as there are no teeth in the rack to hold the carriage in position for writing such additional characters. By my present invention I overcome this difficulty and provide means by which any desired number of additional characters may be readily added in each column, or in as many columns as it may be found necessary or desirajble to add one or more characters over the number provided for by the cutting of the rack teeth on the mutilated rack bar. Such mechanism will now be described.

Parallel with and in the rear of the mutilated rack 27 I mount an auxiliary rack section or bar 41 having a full complement of teeth 42 throughout its length, or so much of it as may be intended for use. The teeth 42 are of the same pitch as the teeth b on the mutilated rack and each tooth b is in fore and aft register with a tooth 42 of the rack 41 when both racks mesh with the feed pinion, as shown in Fig. 2. The rack 41 is mounted on the carriage, preferably as shown, by securing it with the aid of screws 43 (Fig. 5) to two bracket arms 44, one located near each end of the rack 41 and extending upward and forward therefrom. Each bracket arm 44 is secured by a screw 45 (see Fig. 2) to a block 46 fixed by suitable means on a pivot rod 47. This rod turns in bearings 48 (see Fig. 5) each secured by its foot piece 49 .with the aid of two screws 50 to the rear cross bar 6 of the carriage. Each screw 43 also fastens one end of a leaf spring 51 to the companion bracket arm 44. As shown in Fig. 2 these springs extend upward and forward and contact near their free ends with the underside of a cross rod 51l secured to the end plates 52 of the platen frame and which constitutes part of the usual equipment. The force of the springs 51 is exerted therefore to force the feed rack 41 down to mesh with the feed pinion 14. The rack 41 is limited in its downward movement by the pin 35 (Fig. 2) which extends through an opening 53 in said rack and contacts with the upper wall of said opening when the parts are in the normal position, as indicated in Fig. 2. It will be understood that the pin and slot connection between the racks 27 and 41 not only limits the movement of the rack 41 to normal position but also causes the rack 41 to be lifted to releasing position with the rack 27 when the latter is released with the aid of the release key 39. But a further important result is attained by this connection between the feed racks, in that it enables the rack 41 to be moved at any time into and out of engagement with the feed pinion by the automatically operating controlling means without displacing the rack 27 from normal effective position.

I will now describe the above mentioned automatically operating controlling means.

A cam bar 54, which is shown detached in Fig. 3, is provided with depending lugs 55 apertured at 56 to receive the reduced ends of pivot pins 57 and 58, as shown in Fig. 1. Each pivot pin is held by an associated screw 59 in a supporting standard 60, the foot piece 61 of which is apertured to receive a screw 62 or 63 usuallylprovided in the machine for another purpose. Thus, the screw 62 also is employed to secure the escapement bracket 64 in place, whereas the screw 63 also is employed to secure the extension bracket 65 in place. The standards 60 are therefore held firmly on the top plate 1 of the machine under the heads of the screws ('2 and 63. The cam bar is thus mounted on the top plate of the machine parallel with and in the rear of the rack bar 41 and is adapted to receive a pivotal movement fore and aft of the machine around the axis of the pivot pins 57 and 58. This cam bar is returned to, and normally maintained in, its forward effective position, shown in Fig. 2, by a coiled spring 66 (see Figs. 1 and 5) which surrounds an outward extension on the pivot pin 58 and is anchored at one end, 67, to the associated standard 60, and at the opposite end, 68, is connected to the cam bar 54. The length of the cam bar, the number, character and location of the cams thereon, &c. are determined by the character of the mutilated rack 27 and the number of columnar fields from which back spacing is to be effected, as will be better appreciated from what follows. As shown in the present instance the upper portion of the caln bar has a series of rack controlling cams each of which may be said to include an inclined face 69 and a dwell 70 on the upper side of the cam bar. The bar also has a second series of cams which lnay be termed cambar controlling cams, and each of which comprises an inclined face 71 and a dwell 72 on the front side of the cam bar. While the extent of inclined faces 69 of the various cams are uniform, Vor substantially so, the companion dwells 70 vary in length, depending on the extent of the mutilation ein the feed rack 27 with which each particular cam 69-70 is associated. The same is true of the cams 71-72 Referring more particularly to Figs. 1, 5 and 8, it will be seen that a contact device, shown in detail in Fig. 8 and designated as a whole by the reference numeral 73, comprises a plate-likev base 74 riveted at 75 to the rear side of the feed rack 41. A rearwardly extending block or projection 76 on the base plate overlies the upper edge of the cam bar 54 when the parts are in normal position, as shown in Fig. 2. An inclined cam face 77 on the left-hand end of the block, as the parts are viewed from the front of the machine, is adapted to coact with the inclined faces 69 on the cam bar as the carriage moves from right to left and lifts the feed rack 41 out of engagement with the feed pinion 14. After the feed rack 41 is thus lifted and the carriage is moving, the lower face 78 on the projection 76 rest-s on and rides alongI the companion dwell 70 on the cam and thus holds the rack 41 out of engagement with the feed pinion until the abrupt drop 79 at the end of the cam is reached when the projection 76 will drop into a depression 80 in the cam bar, thus dropping the feed rack 41 into mesh with the feed pinion 14. This operation is repeated at each cam 69-70 so that the feed rack 41 is successively automatically raised and lowered as the carriage moves from ri ht to left, establishing an intermeshing eiigective connection between the feed rack 41 `and pinion each time the rack is lowered and breaking such effective connection each time the rack 41 is automatically raised.

The construction and relative arrangement of the parts are such that whenever the carriage has been automatically tabulated or jumped to a columnar field with the aid of the mutilated rack 27, the feed rack 41 will have been automatically dropped into engagement with the feed pinion 14 at about the completion of such tabulating movement. That is to say, this is true of each tabulated position from which it may at any time be found necessary or desirable to back space from the position of arrest one or more spaces, to add one or more characters or digits in ad- Vance of the normal position of arrest. This automatic engagement of the rack 41 with the feed pinion enables the reverse movement of the feed pinion, effected with the aid of the back spacin devices, to be transmitted to the carriage tiirough said feed rack 41. It will be understood that a back spacing of the carriage could not be effected at this time through the mutilated rack, due to the fact that a mutilation e therein is adjacent tb the feed pinion and there would be no teeth in said rack for the pinion to engage with for back spacing.

In order that the feed rack 41 may remain in engagement with the feed pinion during this back spacing movement of the carriage, and not be lifted out of such engagement by the cam bar, one of the cams 71-72 comes into play. Thus the corner 81 of the projection 76 will coact with the adjacent inclined face 71 at the first part of the return motion of the carriage and cam the bar 54 rearward around its pivots 57 and 58 against the force of the spring 66 (as shown in Fig. 5) until the rear corner of the lower face 7 8 of the contact device reaches and rides on the companion dwell 72 of said cam. The contact device will continue to ride on the dwell 72 for the full width of the column in which such back spacing is to be effected. The effeet of this is to automatically shift the cam bar to and maintain it in an ineffective position, where the cams 69-70 are out of cooperative relation with the faces 77 and 78 on the contact device 73, enabling the feed rack 41 to remain in engagement with the feed pinion during the back spacing operation.

Should the carriage be returned or advanced by hand after depressing the carriage release key 39, this latter will lift the .contact device 73 with the racks 27 and 41,

carrying the Contact device out of cooperative relation with the cam bar so that the rack 41 will not be actuated thereby. Should the operator merely return the carriage without rst depressing the carriage release key, then the cam bar 54 will be shifted to and held out of lifting engagement with the rack 41 by the action of the cams 71-72.

The machine in which I have shown my invention embodied includes power mechanism for automatically returning the carriage to the beginning of a. line, such as is disclosed in my hereinbefore mentioned patent. In the present instance I have combined with such carriage return mechanism,

means for automatically rendering the automatically operating controlling means for raising and lowerin the feed rack bar 41 ineffective when sai carriage return mechanism is rendered effective. This is to prevent undue Wear, strain, and noise, and possible injury to the rack controlling mechanism and parts associated therewith. Such mechanism will now be described, it being understood that I have shown only so much of the carriage return mechanism as is necessary to arrive at an understanding of the features of my present invention in their cooperation therewith.

An electric motor 82 has a shaft 83 operatively connected to a bevel pinion 84 which meshes with a bevel gear 85. This gear turns freely on an upright shaft 86 and is provided with a hub having clutch teeth 87 forming one section of a two-part clutch. The other section 88 of the clutch carrles teeth 89 adapted to engage with the teeth 87 and lock the two sections to turn together. The clutch section 88 is mounted on a squared lower end portion of the shaft 86, so that such section is free to move up and down on the shaft but is fixed to turn therewith. An automatically controlled crank arm 90 extends at its free end into a circumferential groove 91 in clutch member 88 to slide said clutch member 88 up or down on the shaft 86 and thus close and open the clutch respectively. The crank arm 90 constitutes one arm of a bell crank lever mounted on a rock shaft 92, the other arm of the bell crank lever being indicated at 93. This latter arm is pivoted to a rod 94 which at its rear end extends into a housing 95 that contains a switch or circuit breaker which controls the circuit through the motor. Said switch includes a spring arm 96 having a contact 97 and against which arm the rear end of the rod 94 bears to normally break the circuit. A second contact 98 is `provided on an arm 99 and when the rock shaft 92 is rocked to close the clutch 87, 88, the rod 94 will be drawn forward, releasing the arm 96 and permitting the contact 97 to coact with the contact 98 to complete the circuit and start the motor. Motion is transmitted from the motor through the pinion 84, gear 85 and shaft 87 to a gear 100 fixed to the upper end of the shaft 87. The gear 100 meshes with a rack 101 fixed to the carriage and the carriage is thus returned to begin a new line. At about the time the carriage is returned the rock shaft 92 is automatically given a reverse rocking motion, thereby breaking the circuit and opening the clutch, leaving these parts in the Fig. 1 position.

The usual means are employed for controlling the rocking of the shaft 92, such means comprising, as shown in Figs. 6 and 9, an adjustable line stop or contact 102 on the carriage which, when the carriage is near the end of the line, coacts with a member 103 and shifts it and the parts controlled thereby, including the rod 104 on which the member 103 is mounted. The rod 104 is connected to an upright arm 105 fixed on a short shaft 106 that carries an arm 107 that projects towards the left. This arm 107 transmits downward motion to an upright link 108. Said link in turn actuates an arm 109 extending from the inside of a housing 110 and controlling a latching mechanism contained within said housing. The release of said latching mechanism releases an arm 111 that is carried by the rock shaft 92 and projects through an opening 112 (see Fig. 1) in the rear of the housing. When the arm 111 is released a coiled spring 113 surrounding the rod 94 shifts said rod forward, thereby releasing the circuit controlling arm 96 to complete the circuit, at the same time closing the clutch 87, 88 and thus return the carriage.

As the carriage nears the en'd of its return movement a margin stop or contact 114 (Fig. 6) coacts with a member 115 carried by a rod 116 connected to an upright arm of a bell crank 117, which in turn is connected to a. depending link 118. The lower end of the link 118 is connected to an arm 119 that projects out from the housing 110 and repositions the parts in the housing 110 that control the arm 111. The effect of this is to lower the arm 111, turn the rock shaft 92 clockwise, as viewed in Fig. 9, and lower the arm 90 at the opposite end of the shaft 92. This results in breaking the circuit and releasing the clutch 87, 88.

Now in order to throw the automatic-ally operating rack lifting mechanism out of operation when the carriage return mechanism is rendered effective I provide the following connections A crank arm 120 is adjustably fixed on the rock shaft 92 with the aid of a set screw 121. The rear end of this arm carries a pin 122 received in a slot 123 in the lower end of an upright link 124. The upper end of this link is slotted in a like manner at 125 to receive a pin 126 that projects laterally from an arm of a sheet metal bracket 127 secured by screws 128 to the cam bar 54.

It will be understood that with this train of connections between the rock-shaft 92 and the cam bar, a rocking of said shaft in one direction to render the power actuated carriage return mechanism effective will result in the cam bar being shifted rearward around its pivots 57, 58 to an ineffective position where `the cams on the bar are out of cooperative relation with the contact device 73. The parts are maintained in this condition until the return of the carriage has been about completed, when, as hereinbefore pointed out, the rock shaft is automatically rocked in the op osite direction to disconnect the motor and reak the circuit. lVhen this occurs the arm 120 is elevated, and the spring 66 will return the cam bar to effective position, prepared to function during the forward travel of the carriage.

By reason of the pin and slot connection 125, 126 between the shaft 92 and the cam bar 54, the intermediate connections between these parts will not interfere with the automatic shifting of the cam bar out of effective position during the back spacing operation, even though the shaft 92 and parts fixedly connected therewith are in the Fig. l position, as they are at this time. Nor will such connections interfere with the automatic shifting of the cam bar to ineffective position should the carriage be returned to the right by hand without depressing the carriage release key 39.

The pin and slot connection 122, 123 at the lower end of the link prevents injury to or a blocking of the parts and enables them to properly function if the cam bar 54 should be held in the ineffective position by a cam dwell 72 at or about the time the rock shaft 92 is automatically actuated to raise the arm 120 from its lowered position to the position indicated in Fig. 1. In short, the pin and slot connections 122, 123 and 125, 126 enable the parts to properly coordinate and function under all possible conditions of use.

It will be understood that in the present instance the cutting of the mutilated rack and the cam bar has been made to accord with a bill sheet of the general character shown at 129 in Fig. 6. In each instance such cutting will be made to accord with the particular requirements encountered, it being further understood that the machine is usually employed to do work of a specific unvarying character in each establishment, or type of establishment, such as a public service corporation for making out bills and simultaneously making entries on ledger and register sheets for, say, gas or electricity, or both, consumed by the customers.

In this bill there are assumed to be thirteen columns to accord with the thirteen separated single teeth, or separated groups of teeth d, in the mutilated rack 27. Each of said teeth or groups of teeth determine how many characters or digits 130 may be written in each column without recourse to the back spacing mechanism. This is what is intended to be represented in Fig. 6 and it may be pointed out that this ordinarily takes care of the entries to be made. But it occasionally occurs that a higher number, higher than is taken care of by the mutilated rack teeth, is required in a given column or in each of the columns, say for example, that the writing of a number of siX digits is required in each of columns eight and eleven (counting from the left) under the headings of Gross instead of a number of four digits, as provided for by the teeth of the mutilated rack. As each other work sheet to be filled in.

of these columns is arrived at by an automatic tabulation, the feed rack 41 is automatically dropped into mesh with the feed pinion. The operator may therefore back space the carriage twice which will bring the Work sheet in a position where the writing of a number of six digits instead of four may be started in the columnar field at the printing oint. The operator proceeds to write the six digit number in this column, and as the digit of the lowest order is written th'e carriage will be automatically tabulated to bring the next columnar field to the printing point, and so on.

From the foregoing it will be understood that the cam bar may be provided with the cams 69-70, and 71-72 situated at various pointsl along the length thereof, and that the cam surfaces 70 and 72 may be of various lengths, all to accord with the particular requirements or work to be done, or the-bill or For example, in a given column, by, reason of the character of the entry to be made therein, it may be unnecesary at any time to back space the carriage from the position to which the carriage is automatically jumped with the aid of the mutilated feed rack. If at this point the contact device 7 3 has reached the cam bar, then there may be provided at such point a dwell 7 0 on the cam bar which will prevent the auxiliary feed rack 41 from dropping down into mesh with the feed pinion. Therefore, ,at this point no intermittent back-spacing of the carriage can be effected. Of course this provision ma be made at as many columnar positions o the carriage as may be required for the particular work in hand. It will be understood, however, that no articular harm can result even if the auxiliary rack is dropped into mesh with the feed pinion at every columnar field to which the carriage may be automatically brought with the aid of the mutilated feed rack, even though there is never any necessit for back spacin from certain of the ositions thus selecte The advantage of roppin the auxiliary feed rack into mesh with `t e feed pinion only at the points from which backV spacing may be required, is to prevent unnecessary operations of the parts and to prevent the operator from back spacing the carriage in one or more columns in which no back s acing should be effected.

From the foregolng description it will be understood that I have provided means for automatically effecting a tabulating movement of the carriage from one columnar ppsition to the next to ether with bac ing means; that the cam ar and rack bar 41 constitute automatically operatin controlling means for rendering the bac spaclng means effective when the carriage is in its tabulated position, and that such controlling means are rendered ineffective or inoperative when the power actuated carriage return mechanism is rendered effective. The means by which the proper denominational position to begin an entry in each column is obtained in the present construction, whether obtained with the aid of the automatic tabulator alone or in conjunction with the back spacmg mechanism, is especially important in a combined typewriting an computing machine, such as the present invention is 7 shown embodied in, for the following reasons in addition to those which are made apparent from what has been hereinbefore pointed out:

While, of course, it is highly desirable to have the numbers in each column on the hill sheet, ledger sheet, and register sheet appear one above the other with each digit appearin in its proper denominational position, it 1s absolutely necessary that the totalizer for each column to be added shall be positioned correctly in each denominational position of the number to be written and added. This result is attained with assurance with the aid of the present construction. In Fig. 6 I have attempted to illustrate Vthis with the aid of a single diagrammatically represented totalizer 131 connected with the carriage. This totalizer, as shown, has been automatically brought to a position relatively to the master wheel 132 where the wheel of the fourth order in said totalizer will be actuated when a numeral of that order is written in the eighth column under the heading Gross Should the operator desire to write a number in this column containing five digits, the operator after this column has been automatically brought to the fourth denominational position, as shown, will back space the 105 carriage once or one letter space. This not only will position the carriage where writing may begin in the tens of thousands position, but the totalizer for this column will have been back spaced with the carriage to a 110 position Where the wheel of the fifth order will be actuated at the first printing stroke of a numeral key, and so on.

Various changes may be made in the construction and certain features thereof may 115 be employed without others, without departing from my invention as it is defined in the accompanying claims.

What I claim as new and desire to secure by Letters Patent, is

1. The combination of a carriage, means which .include a mutilated feed rack for enabling the carriage to receive an automatic tabulating movement from one columnar position to another, and means effective to 125 intermittently back space the carriage from its tabulated position.

2. The combination of a carriage, means which include a mutilated feed rack and intermeshing feed pinion for enabling the car- 130 riage to receive an automatic tabulating movement from one columnar position to another, back spacing means which effect a step-bystep reverse movement of said feed pinion, and means which enable said reverse movement of the feed pinion to be transmitted to the carriage to back space it from its tabulated position.

3. The combination of a carriage, means which include a mutilated feed rack and intermeshing feed pinion for enabling the carriage to receive an lautomatic tabulating movement from one columnar position to another, back spacing means which effect a step-by-step reverse movement of said feed pinion, an auxiliary feed Pack, and automatically operating means for engaging said auxiliary feed rack with said pinion when the carriage is in a tabulated position.

4. The combination of a carriage, means which include a mutilated feed rack and intermeshing feed pinion for enabling the carriage to receive an automatic tabulating movement from one columnar position to another, back spacing means which effect a step-by-step reverse movement of said feed pinion, an auxiliary feed rack, and automaticallyy operating controlling means for holding said auxiliary feed rack out of mesh with said feed pinion during the tabulating movement of the carriage and for bringing the auxiliary feed rack into mesh with the feed pinion at about the completion of the tabulating movement of the carriage.

5. The combination of a carriage, means which include a mutilated feed rack and intermeshing feed pinion for enabling the carriage to receive an automatic tabulating movement from one columnar position to another, back spacing means which effect a step-by-step reverse movement of said feed pinion, an auxiliary feed rack, and automatically operating controlling means for holdingr said auxiliary feed rack out of mesh with said feed pinion during the tabulating movement of the carriage and for bringing the auxiliary feed rack into mesh with the feed pinion at about the completion of the tabulating movement of the carriage, said controlling means comprising a cam and a cooperative engaging member, one carried by the carriage and the iother carried by the frame of the machine, whereby said cam and engaging member will bring about an engagement or disengagement between said auxiliarymack and pinion, depending on the position of the carriage in its line of travel.

6. The combination of a carriage, a mutilated feed rack having teeth removed therefrom at a` pluralitv of points i n the length thereof, a cooperative feed pmion, the construction enabling the carriage to be automatically tabulated to the next columnar position Whenever a. mutilatlon 1n the feed rack reaches said feed pinion, and means 1ncluding back spacing mechanism for effecting a step-by-step back spacing movement of the carriage from any of a plurality of different columnar positions to which the carriage may beV automatically tabulated.

7. The combination of a carriage, a mutilated feed rack having teeth removed therefrom at a plurality of points in the length thereof, a cooperative feed pinion, the construction enabling the carriage to be automatically tabulated to the next columnar position Whenever a mutilation in the feed rack reaches said feed pinion, back spacing mechanism for effecting a step-by-step reverse movement of the feed pinion, an auxiliary feed rack, and automatically operating controlling means for effecting an engagement between said auxiliary feed rack and feed pinion at each of the tabulated positions of the carriage from which it may be necessary or desirable to back space the carriage, whereby the reverse movement of the feed pinion may be transmitted through said auxiliary rack to the carriage at each of said tabulated positions of the carriage.

8. The combination of a carriage, a mutilated feed rack having teeth removed therefrom at a plurality of points in the length thereof, a cooperative feed pinion, the construction enabling the carriage to be automaticallv tabulated to the next columnar position Whenever a mutilation in the feed rack reaches said feed pinion, back spacing mechanism for effecting a step-by-step reverse movement of the feed pinion, an auxiliary feed rack, and automatically operating controlling means for effecting an engagement between said auxiliary feed rack and feed pinion at each of the tabulated positions of the carriage from which it may be necessary or desirable to back space the carriage. Whereby the reverse movement of the feed pinion may be transmitted through said auxiliary rack to the carriage at each of said tabulated positions of the carriage, said automatically operating means comprising'a series of cams on the frame of the machine and a contact device carried by said auxiliary rack and coacting with said cams to determine the points in the travel of the carriage Where the auxiliary rack will be maintained out of mesh with the pinion and the points Where such engagement may be effected.

9. The combination of a carriage, means which include a mutilated feed rack and an intermeshing feed pinion for enabling the carriage to receive an automatic tabulating movementfrom one columnar position to another, back spacing means which effect a step-by-step reverse movement of said feed A rack, automatically pinion, an auxiliary feed operating means for engaging said auxiliary feed rackwith said pimon when the vcarriage is in its tabulated operating means for rendering said last menposition, and automatically tioned means ineffective during the back spacing operation.

10. The combination of a carriage, means which include a mutilated feed rack and intermeshing feed pinion for enabling the carriage to receive an automatic tabulating movement from one columnar position to another, back spacing means which effect a stepby-step reverse movement of said feed pinion, an auxiliary feed rack, automatically operating controlling means for holding said auxiliary feed rack out of mesh yvith said feed pinion during the tabulating movement of the carriage and for bringing the auxiliary feed rack into mesh with the feed pinion at about the completion of the tabulating movement of the carriage, and automatically operating means for rendering said controlling means ineffective during the back spacing operation.

11. The combination of a carriage; means which include a mutilated feed rack and intermesliing feed pinion for enabling the carriage to receive an automatic tabulating movement from one columnar position to another; back spacing means which effect a step-by-step reverse movement of said feed pinion; an auxiliary feed rack; automatically operating controlling means for holding said auxiliary feed rack out of mesh with said feed pinion during the tabulating movement of the carriage and forl bringing the auxiliary feed rack into mesh with the feed inion at about the completion of the tabulating movement of the carriage, said controlling means comprising a cam and a cooperative engaging member, one carried by the carriage and the other one carried by the frame of the machine. whereby said cam and engaging member will bring about an engagement or disengagement between said auxiliary rack and pinion depending on the position of the carriage in its line of travel; and automatically operating means for rendering said caln and engaging member ineffective one on the other during the back spacing operation.

12. The combination of a carriage, a mutilated feed rack having teeth removed therefrom at a plurality of points in the length thereof, a cooperative feed pinion, the construction enabling the carriage to be automatically tabulated to the next columnar position whenever a mutilation in the feed rack reaches the said feed pinion, back spacing mechanism for effecting aAstep-by-step reverse movement of the feed pinion, an auxiliary feed rack, automatically operating contnolling means for effecting an engagement between said auxiliary feed rack and feed pinion at each of the tabulated ositions of the carriage from which it may e necessary or desirable to back space the carriage, whereby the reverse movement of the feed pinion may be transmitted through said auxiliary rack to the carriage at each of said tabulated positions of the carriage, and automatically operating means for rendering said controlling means ineffective during the back spacing of the carriage.

13. The combination of a carriage, a mutilated feed rack having teeth removed therefrom at a plurality of points in the length thereof, a cooperative feed pinion, the construction enabling the carriage to be automatically tabulated to the next columnar position whenever a mutilation in the feed rack reaches said feed pinion, back spacing mechanism for effectin a step-by-step reverse movement of the eed pinion, an auxiliary feed rack, automatically operating controlling means for effecting an engagement between said auxiliary feed rack and feed pinion at each of the tabulated positions of the carriage from which it may be necessary or desirable t0 back space the carriage, whereby the reverse movement of the feed inion ma be transmitted through said auxiliary rac to the carriage at each of said tabulated positions of the carriage, said automatically operating means comprising a series of cams on the frame of the machine and a contact device carried by said auxiliary rack and coacting with said cams to determine the points in the travel of the carriage where the auxiliary rack will be maintained out of mesh with the pinion and the points where such engagement may be effected, andv automatically operating means for shifting said cams out of cooperative relation with said contact device during the back spacing of the carriage..

14. The combination of a carriage, power actuated means for returning the carriage to begin a line of writing, automatically operating means for effecting a tabulating movement of the carriage from one columnar position to the next, back spacing means, automatically o erating controlling-means for rendering sai back spacing mechanism effective when the carriage is in its tabulated position, and automatically operating means actuated when the power actuated carriage returning means are rendered effective for rendering said controlling means inffective.

15. The combination of a carriage, power actuated means for returning the carriage to begin a line of writing, amutilated feed rack, a cooperative feed pinion an auxiliary feed rack cooperative with said feed pinion, back spacing devices for effectin an intermittent reverse movement of said eed pinion, automatically operating controlling means for bringing about an intermeshing engagement between said auxiliary feed rack and pinion at a predetermined point in the travel of the carriage thereby rendering the reverse movement of tlie feed pinion effective to intermittently back space the carriage throu h said auxiliary feed rack, and automatica ly operating means actuated when the power actuated carriage returning means are ren-y dered effective for rendering said controlling means ineffective.

16. The combination of a carriage, power actuated means for returning the carriage to begin a line of writing, controlling means therefor, a mutilated feed rack, a feed pinion cooperative with said mutilated feed rack, an auxiliary feed rack which coacts with said feed pinion, back spacing devices that effect an intermittent reverse movement of said feed' pinion, cam devices that automatically control the relative movement of the auxiliary rack and feed pinion into and out of intermcshing engagement at one or more predetermined points in the travel of the carriage, and means actuated by said controlling means for automatically rendering said cam devices ineffective.

17. The combination of a carriage; means for automatically tabulating the carriage from one columnar position to the next; and means for back spacing the carriage intermittently from such tabulated position comprising automatically operating controlling means for rendering the back spacing means effective when the carriage is in the tabulated position, and automatically operating means for rendering said controlling means ineffective during the back spacing of the carriage.

18. The combination of a carriage; means for automatically tabulating the carriage from one columnar position to the next; means for back spacing the carriage intermittently from such tabulated position comprising automatically operating controlling means for rendering the back spacing means effective when the carriage is in the tabulated position, and automatically operating means for rendering said controlling means ineffective during the back spacing of the carriage; power means for returning the carriage to begin a line of writing; controlling devices therefor; and means automatically controlled by said controlling devices for rendering said rst mentioned controlling means ineffective.

19. The combination of a carriage, means for automatically tabulating the carriage from one columnar position to the next, back spacing means, automatically operating controlling means for rendering said back spacing means effective when the carriage arrives at a tabulated position, and automatically operating means for rendering said controlling means ineffective during a return movement of the carriage.

20. The combination of a carriage, power actuated mechanism for returning the carriage to begin a line of writing, means for automatically tabulating the carriage from one columnar position to the next, back spacing means, automatically operating controlling means for rendering said back spacing means effective when the carriage arrives at a tabulated position, and automatically operating means for rendering said controlling means ineffective during a return of the carriage whether such return be effected by the back spacing means or by the power actuated carriage return mechanism.

Signed at the borough of Manhattan, cit of New York, in the county of New Yor and State of New York this 23rd day of December, A. D. 1927.

FREDERICK A. HART. 

